# CVE-2021-3658: Security feature bypass in bluez

> Bluez incorrectly restores Bluetooth discoverability after power cycles, potentially exposing the stack to nearby attackers.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 2 Mar 2022
- **Updated:** 15 Apr 2026
- **Also known as:** DEBIAN-CVE-2021-3658, GHSA-839c-8x38-qf59, MGASA-2021-0395, OESA-2021-1370, UBUNTU-CVE-2021-3658

## What is CVE-2021-3658?

CVE-2021-3658 is a medium-severity vulnerability in Fedoraproject Fedora, published on 2 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

bluetoothd from bluez incorrectly saves adapters' Discoverable status when a device is powered down, and restores it when powered up. If a device is powered down while discoverable, it will be discoverable when powered on again. This could lead to inadvertent exposure of the bluetooth stack to physically nearby attackers.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2021-3658?

It affects 2 products.


Products: Bluez Bluez, Fedoraproject Fedora.

## How do I fix CVE-2021-3658?

Apply the vendor's patch.

## Is CVE-2021-3658 being exploited?

There is no known exploitation of CVE-2021-3658 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2021-43400](https://insights.sbomify.com/CVE-2021-43400/): Use after free in n/a (critical 9.1)
- [CVE-2024-8805](https://insights.sbomify.com/CVE-2024-8805/): BlueZ HID over GATT Profile Improper Access Control Remote Code Execution Vulnerability (high 8.8)
- [CVE-2022-39176](https://insights.sbomify.com/CVE-2022-39176/): Information disclosure in n/a (high 8.8)
- [CVE-2022-39177](https://insights.sbomify.com/CVE-2022-39177/): Denial of service in n/a (high 8.8)
- [CVE-2022-0204](https://insights.sbomify.com/CVE-2022-0204/): Memory corruption in bluez (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-3658 and fix it if it is affected.

What it is: CVE-2021-3658 is a medium-severity vulnerability in Fedoraproject Fedora, published on 2 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-3658 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-3658/ (Markdown: https://insights.sbomify.com/CVE-2021-3658/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3658
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3658
- OSV: https://osv.dev/vulnerability/CVE-2021-3658

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-3658/
Summaries are generated and may contain mistakes; the official description above is the record.